and I am happy to report that for me - the Savour RTA is a Excellent !

I have tried it in both MTL and DL configuration - its a tight MTL with that insert - I adjust the airflow control to provide more air or a loose MTL using the larger DL insert - I adjust the airflow control down to one hole - both style are easy to build wick and fill - leak free and good flavour.

ok I am a like Goldilocks... the small one .. I use with all air open is too small.... and the big one .. with one hole open is too big ..

BUT this tank is totally leak-proof.. refill with air open and not a drop of seepage... and good flavour.. look its not a top tank but it is good..

so how hard is it to drill out the small one...

I drilled it to a 1.5mm hole and is a lot better but still with wide open air I want slightly more..I’m going to try and drill to a 1.8mm hole and see if it’s possible..
I found everything as you do..big one far too much small one far to little no matter air adjustments for the life of me don’t understand how they never got this before deciding on the air hole size..

Okay mate so I drilled it out to now 1.8mm
With the air holes just about open at half of last hole it’s the perfect draw for me now..experimenting with air it made no difference full open two open one open only when down to just a half a hole did it draw like I wanted...all sorted for me I will stick with that..
@simong I’m happy to post the 1.8mm drill bit to you it actually fitted into my ryobi one conventional drill and made it real simple to drill out..done in seconds..

bearing in mind it is me .. limited brain and ability .. but has a drill... and a vice to hold the lil thingy..and expectations of being able to do ANYTHING - do we call them 1.8mm drill bits here ? and what could go wrong ... please tell me ! I have two so If I stuff one all is not lost !

Yes, 1.8mm is a drillbit size. Be sure to use a steady, strong grip when drilling. The edge of the bit will often want to catch and jam, when opening up a smaller hole. This can result in the drill trying to spin out of your hand or (more likely with little bits) break the bit.

Use a high speed too, but don't try to go through in one attempt, use several, use lesser pressure and try not to overheat the bit too much. It also depends on the grade of material that you are trying to drill. If it's SS, a little kerosene will aid the drilling but that's not what you want around vape gear......Brass, it will drill easily but 'grab' easily too & kero will help there as well. Local engineering supplies place will have a heap of sizes under 2mm.
Thinking oxy torch/ tip drills here!
Good luck!

An imperfect solution, as a trial run. Put a little wad of wick in the hole, to partly block it. At least that way you can suck it and see if you get the satisfaction you were hoping for. I did this with doggy's stumpy, to see if less air improved the already exceptional vape (it didn't).